Thanks for the help.But still have questions.Is two feet long enuf to launch a tennis ball.Is twice the volume of the barrel enuf or to much.I seen a launcher for tennis balls to raise antennas and he is using 16 ''barrel at 2.5'' and 8'' comb at 4''.He claims 100 to 150 feet.Would a longer barrel longer comb chamber make a difference.I am looking at geardogs post from 11/13/2009 and this is about the idea i had or mine.Does it work well and how long of a barrel and comb chamber did you use.thanks again

velocity3x wrote:That make sense to me but.... I live on the west side of the equator where everything makes sense.

Including the phrase "West of the equator", apparently.

pwnd!!!

Anyway, about your the longer barrel and or chamber, a longer barrel is almost always more powerful, as is a larger chamber. Eventually, you run into diminishing returns, especially in terms of range. At the extreme end, you will get a few feet extra range from a few more feet of barrel.

Ragnarok wrote:Including the phrase "West of the equator", apparently.

ramses .....pwnd!!!

jackssmirkingrevenge..... Genuinely pwnd!

As I've been a Civil Engineer for 39 years, I assure you that I'm quite aware of the magnetic bearing of the equator but, this is the first time ANYONE has EVER taken my "west" statement seriously. I didn't think it was possible until now, however... I do thank you for stepping up to enlighten me.....lol

velocity3x wrote:this is the first time ANYONE has EVER taken my "west" statement seriously.

If you were counting on no-one taking it seriously on the basis that it sounded too ridiculous for anyone to actually say seriously - I should tell you that I've heard people say far stupider things and mean them.

Me again back from lowes and the local hardware store.They do not sell 4 inch pressure rated pvc only foam core which i believe wont work.Is this correct?I figure i need about 16 inches for my air chamber.Anyone have any ideas?I bought the largest pressure rated pvc which is 1.5 inch.Now with a 24 inch 2.5 barell i will have to run three lengths to make up for no 4 inch.I think this will look dumb.Can anyone enlighten me on how else to do this .Thanks again.